KASAN: slab-out-of-bounds Read in usbhid_close

From: syzbot <syzbot+3268ee512f866a903602@syzkaller.appspotmail.com>
To: andreyknvl@google.com, benjamin.tissoires@redhat.com,
	jikos@kernel.org, linux-input@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	syzkaller-bugs@googlegroups.com
Subject: KASAN: slab-out-of-bounds Read in usbhid_close
Date: Tue, 06 Aug 2019 06:18:08 -0700	[thread overview]
Message-ID: <000000000000d6225c058f72a7df@google.com> (raw)

Hello,

syzbot found the following crash on:

HEAD commit:    e96407b4 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=117a9f42600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e
dashboard link: https://syzkaller.appspot.com/bug?extid=3268ee512f866a903602
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3268ee512f866a903602@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x302a/0x3b50  
kernel/locking/lockdep.c:3753
Read of size 8 at addr ffff8881ceab68a0 by task syz-executor.0/3352

CPU: 1 PID: 3352 Comm: syz-executor.0 Not tainted 5.3.0-rc2+ #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  print_address_description+0x6a/0x32c mm/kasan/report.c:351
  __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
  kasan_report+0xe/0x12 mm/kasan/common.c:612
  __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
  lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
  __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
  _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167
  spin_lock_irq include/linux/spinlock.h:363 [inline]
  usbhid_close+0x51/0x210 drivers/hid/usbhid/hid-core.c:740
  hid_hw_close+0xa8/0xd0 drivers/hid/hid-core.c:2046
  drop_ref.part.0+0x32/0xe0 drivers/hid/hidraw.c:337
  drop_ref drivers/hid/hidraw.c:360 [inline]
  hidraw_release+0x34f/0x440 drivers/hid/hidraw.c:356
  __fput+0x2d7/0x840 fs/file_table.c:280
  task_work_run+0x13f/0x1c0 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x8ef/0x2c50 kernel/exit.c:878
  do_group_exit+0x125/0x340 kernel/exit.c:982
  get_signal+0x466/0x23d0 kernel/signal.c:2728
  do_signal+0x88/0x14e0 arch/x86/kernel/signal.c:815
  exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:159
  prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
  do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:299
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: Bad RIP value.
RSP: 002b:00007f123439dcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c
R13: 00007ffe9281699f R14: 00007f123439e9c0 R15: 000000000075bf2c

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8881ceab6880
  which belongs to the cache shmem_inode_cache of size 1168
The buggy address is located 32 bytes inside of
  1168-byte region [ffff8881ceab6880, ffff8881ceab6d10)
The buggy address belongs to the page:
page:ffffea00073aad00 refcount:1 mapcount:0 mapping:ffff8881da115180  
index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da115180
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881ceab6780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8881ceab6800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881ceab6880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                ^
  ffff8881ceab6900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8881ceab6980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.